How to match the device with your phone(GPS/MP3): 1.Full charge the 2 devices before use 2.Press down the "Power/rider A" button on 2 devices simultanously for about 5~9 seconds until the red and blue light flashing alternately 3. Press down the "Power/rider A" button ONCE on any one of the two devices, wait for 8~13seconds until only blue LED lights flash on both the 2 devices 4. Press down the "Power/rider A" button ONCE again on any one of the two devices, wait for 2~4seconds until the blue lights on the 2 devices light at the same time for 2seconds and you can hear"DuDu" sound from the speakers 5. The match between the 2 devices is successful. You can talk with each other through these 2 devices now!
Suit for Full-face & Half-face Helmet :